Details

Autor(en) / Beteiligte

• Liu, Lianlian
• Fang, Liang
• Wu, Fang
• Hu, Jia
• Zhang, Shufang
• Luo, Haijun
• Hu, Bashan
• Zhou, Miao

Titel

Self-supported core-shell heterostructure MnO2/NiCo-LDH composite for flexible high-performance supercapacitor

Ist Teil von

• Journal of alloys and compounds, 2020-05, Vol.824, p.153929, Article 153929

Ort / Verlag

Lausanne: Elsevier B.V

Erscheinungsjahr

2020

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• Nickel cobalt layered double hydroxides (NiCo-LDHs) nanosheets (NSs) were synthesized on a flexible carbon cloth (CC) substrate by a simple hydrothermal method. Then the manganese dioxide (MnO2) NSs were directly deposited on the NiCo-LDH/CC to form three-dimensional (3D) self-supported core-shell MnO2/NiCo-LDH/CC flexible electrodes. The MnO2 NSs with three different loading amount on NiCo-LDH/CC substrate, named MnO2-1/NiCo-LDH/CC, MnO2-2/NiCo-LDH/CC and MnO2-3/NiCo-LDH/CC, were hydrothermally synthesized in 0.01 M, 0.02 M and 0.03 M potassium permanganate (KMnO4) solution, respectively. The morphology and electrochemical performance of these obtained composite electrodes were observed and analyzed. The MnO2-2/NiCo-LDH/CC electrode exhibits a capacitive performance of 312 F g−1 at 0.2 A g−1 (937 mF cm−2 at 1 mV s−1) and maintains 97% of the original capacitance after 5000 charge-discharge cycles. The good mechanical stability and excellent cycle performance of MnO2-2/NiCo-LDH/CC electrode is benefit from the numerous channels for rapid electron transport provided by the large specific surface area and self-supported of NiCo-LDH nanoflakes. Therefore, the MnO2-2/NiCo-LDH/CC composite electrode is a potential candidate in wearable energy storage device. [Display omitted] •3D self-standing core-shell MnO2/NiCo-LDH heterostructure was successfully fabricated on flexible carbon cloth.•The conductivity and active sites of electrode are enhanced by the introduction of NiCo-LDH.•The appropriate MnO2 loadings amount for MnO2/NiCo-LDH composites was optimized.•MnO2-2/NiCo-LDH/CC electrode displays an excellent capacitance retention of 97% after 5000 cycles.